Fix basic type handling and add a sample

examples/type-processing/README.md

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+## Overview
+
+This sample demonstrates the supported types of the Ballerina MI connector SDK. A Ballerina function with parameters and return type of `boolean`, `string`, `int`, `float`, `decimal`, `xml`, and `json` is supported by the MI SDK.
+This scenario illustrates a content-based routing use case where a JSON payload containing a `type` property is sent to an API. Based on the value of this `type` property, a corresponding Ballerina function is invoked.
+
+A json payload of following format is sent to the endpoint
+
+```json
+{
+    "type": "integer",
+    "val": 21
+}
+```
+
+For the type field it is possible to send `boolean`, `string`, `int`, `float`, `decimal`, `xml`, and `json`.
+
+This would output a result in the following format.
+
+```json
+{
+   "result": 42
+}
+```
+
+## Steps to Invoke the Sample
+
+Follow these steps to invoke the sample using the connector:
+
+1. The `bal-type-processing` folder contains the Ballerina code for the connector. Invoke the following command to generate the connector:
+
+    ```bash
+    bal mi -i <ballerina-project>
+    ```
+
+2. A ZIP file of the connector will be generated. Add this ZIP file to the MI project inside the folder `mi-type-processing` following the approach described [here](https://mi.docs.wso2.com/en/latest/develop/creating-artifacts/adding-connectors/).
+
+3. Once the connector is added, run the MI project.
+
+4. Send an HTTP POST request to the following resource with a payload as specified:
+
+   ```bash
+   curl --location 'http://localhost:8290/type-processing' \
+   --header 'Content-Type: application/json' \
+   --data '{
+      "type": "decimal",
+      "val": 5.3
+   }'
+   ```
+
+   Output:
+
+   ```json
+   {
+      "result":15.3
+   }
+   ```

examples/type-processing/bal-type-processing/Ballerina.toml

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+[package]
+org = "testOrg"
+name = "bal_type_processing"
+version = "0.1.0"
+distribution = "2201.9.2"
+
+[build-options]
+observabilityIncluded = true
+
+[[dependency]]
+org = "ballerinax"
+name = "mi"
+version = "0.1.3"
+repository = "local"

examples/type-processing/bal-type-processing/main.bal

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+import ballerinax/mi;
+
+@mi:ConnectorInfo
+public function invertBoolean(boolean b) returns boolean => !b;
+
+@mi:ConnectorInfo
+public function doubleInt(int n) returns int => n * 2;
+
+@mi:ConnectorInfo
+public function reciprocalFloat(float f) returns float {
+    if f == 0.0 {
+        return 1;
+    }
+    return 1.0 / f;
+}
+
+@mi:ConnectorInfo
+public function addConstantToDecimal(decimal d) returns decimal => d + 10;
+
+@mi:ConnectorInfo
+public function doubleString(string s) returns string => s + s;
+
+@mi:ConnectorInfo
+public function getJsonNameProperty(json j) returns json {
+    json jsn = j;
+    if jsn is string {
+        json|error je = jsn.fromJsonString();
+        if je is error {
+            return {err: je.message()};
+        }
+        jsn = je;
+    }
+    json|error val = jsn.name;
+    if val is error {
+        return {err: val.message()};
+    }
+    return {val};
+}
+
+@mi:ConnectorInfo
+public function getXmlNameElement(xml x) returns xml {
+    xml y = x/<name>;
+    return xml `<result>${y}</result>`;
+}

examples/type-processing/mi-type-processing/deployment/deployment.toml

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+[server]
+hostname = "localhost"
+hot_deployment = false
+
+[user_store]
+type = "read_only_ldap"
+
+[keystore.primary]
+file_name = "repository/resources/security/wso2carbon.jks"
+password = "wso2carbon"
+alias = "wso2carbon"
+key_password = "wso2carbon"
+
+[truststore]
+file_name = "repository/resources/security/client-truststore.jks"
+password = "wso2carbon"
+alias = "symmetric.key.value"
+algorithm = "AES"

examples/type-processing/mi-type-processing/deployment/docker/Dockerfile

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+ARG BASE_IMAGE
+FROM ${BASE_IMAGE}
+COPY CompositeApps/*.car ${WSO2_SERVER_HOME}/repository/deployment/server/carbonapps/
+COPY resources/wso2carbon.jks ${WSO2_SERVER_HOME}/repository/resources/security/wso2carbon.jks
+COPY resources/client-truststore.jks ${WSO2_SERVER_HOME}/repository/resources/security/client-truststore.jks